std::time_get::get_time
Defined in header <locale> | | |
|---|---|---|
public: iter_type get_time( iter_type beg, iter_type end, std::ios_base& str, std::ios_base::iostate& err, std::tm* t) const; | (1) | |
protected: virtual iter_type get_time( iter_type beg, iter_type end, std::ios_base& str, std::ios_base::iostate& err, std::tm* t) const; | (2) | |
1%29公共成员函数，调用受保护的虚拟成员函数。do_get_time最派生的类。
2%29从序列中读取连续字符。[beg, end)并按照格式说明符的相同规则解析时间值。
'%X' | (until C++11) |
|---|---|
"%H:%M:%S" | (since C++11) |
函数所使用的std::get_time，，，time_get::get，以及POSIX函数strptime()
所分析的时间存储在std::tm结构由论点指出t...
如果在读取有效值之前到达结束迭代器，则函数设置std::ios_base::eofbit在err如果遇到解析错误，则函数将std::ios_base::failbit在err...
参数
beg | - | iterator designating the start of the sequence to parse |
|---|---|---|
end | - | one past the end iterator for the sequence to parse |
str | - | a stream object that this function uses to obtain locale facets when needed, e.g. std::ctype to skip whitespace |
err | - | stream error flags object that is modified by this function to indicate errors |
t | - | pointer to the std::tm object that will hold the result of this function call |
返回值
中的最后一个字符[beg, end)这被确认为有效日期的一部分。
注记
对于默认时间格式%28(如果有%29)的字母部分，此函数通常不区分大小写。
如果遇到解析错误，则此函数的大多数实现将离开。*t未经修改。
例
二次
#include <iostream>
#include <locale>
#include <sstream>
#include <iterator>
void try_get_time(const std::string& s)
{
std::cout << "Parsing the time out of '" << s <<
"' in the locale " << std::locale().name() << '\n';
std::istringstream str(s);
std::ios_base::iostate err = std::ios_base::goodbit;
std::tm t;
std::istreambuf_iterator<char> ret =
std::use_facet<std::time_get<char>>(str.getloc()).get_time(
std::istreambuf_iterator<char>(str),
std::istreambuf_iterator<char>(),
str, err, &t
);
str.setstate(err);
if(str) {
std::cout << "Hours: " << t.tm_hour << ' '
<< "Minutes: " << t.tm_min << ' '
<< "Seconds: " << t.tm_sec << '\n';
} else {
std::cout << "Parse failed. Unparsed string: ";
std::copy(ret, std::istreambuf_iterator<char>(),
std::ostreambuf_iterator<char>(std::cout));
std::cout << '\n';
}
}
int main()
{
std::locale::global(std::locale("ru_RU.utf8"));
try_get_time("21:40:11");
try_get_time("21-40-11");
std::locale::global(std::locale("ja_JP.utf8"));
try_get_time("21時37分58秒");
}二次
产出：
二次
Parsing the time out of '21:40:11' in the locale ru_RU.utf8
Hours: 21 Minutes: 40 Seconds: 11
Parsing the time out of '21-40-11' in the locale ru_RU.utf8
Parse failed. Unparsed string: -40-11
Parsing the time out of '21時37分58秒' in the locale ja_JP.utf8
Hours: 21 Minutes: 37 Seconds: 58二次
另见
get_time (C++11) | parses a date/time value of specified format (function template) |
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